[PATCH v3 29/34] iommu/omap: Convert to probe/release_device() call-backs

Joerg Roedel
2020-04-29T13:37:54Z

Convert the OMAP IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/omap-iommu.c | 49 ++++++++++----------------------------
1 file changed, 13 insertions(+), 36 deletions(-)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index ecc9d0829a91..6699fe6d9e06 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1640,15 +1640,13 @@ static phys_addr_t omap_iommu_iova_to_phys(struct iommu_domain *domain,
return ret;
}

-static int omap_iommu_add_device(struct device *dev)
+static struct iommu_device *omap_iommu_probe_device(struct device *dev)
{
struct omap_iommu_arch_data *arch_data, *tmp;
+ struct platform_device *pdev;
struct omap_iommu *oiommu;
- struct iommu_group *group;
struct device_node *np;
- struct platform_device *pdev;
int num_iommus, i;
- int ret;

/*
* Allocate the archdata iommu structure for DT-based devices.
@@ -1657,7 +1655,7 @@ static int omap_iommu_add_device(struct device *dev)
* IOMMU users.
*/
if (!dev->of_node)
- return 0;
+ return ERR_PTR(-ENODEV);

/*
* retrieve the count of IOMMU nodes using phandle size as element size
@@ -1670,27 +1668,27 @@ static int omap_iommu_add_device(struct device *dev)

arch_data = kcalloc(num_iommus + 1, sizeof(*arch_data), GFP_KERNEL);
if (!arch_data)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);

for (i = 0, tmp = arch_data; i < num_iommus; i++, tmp++) {
np = of_parse_phandle(dev->of_node, "iommus", i);
if (!np) {
kfree(arch_data);
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
}

pdev = of_find_device_by_node(np);
if (!pdev) {
of_node_put(np);
kfree(arch_data);
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
}

oiommu = platform_get_drvdata(pdev);
if (!oiommu) {
of_node_put(np);
kfree(arch_data);
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
}

tmp->iommu_dev = oiommu;
@@ -1699,46 +1697,25 @@ static int omap_iommu_add_device(struct device *dev)
of_node_put(np);
}

+ dev->archdata.iommu = arch_data;
+
/*
* use the first IOMMU alone for the sysfs device linking.
* TODO: Evaluate if a single iommu_group needs to be
* maintained for both IOMMUs
*/
oiommu = arch_data->iommu_dev;
- ret = iommu_device_link(&oiommu->iommu, dev);
- if (ret) {
- kfree(arch_data);
- return ret;
- }
-
- dev->archdata.iommu = arch_data;
-
- /*
- * IOMMU group initialization calls into omap_iommu_device_group, which
- * needs a valid dev->archdata.iommu pointer
- */
- group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group)) {
- iommu_device_unlink(&oiommu->iommu, dev);
- dev->archdata.iommu = NULL;
- kfree(arch_data);
- return PTR_ERR(group);
- }
- iommu_group_put(group);

- return 0;
+ return &oiommu->iommu;
}

-static void omap_iommu_remove_device(struct device *dev)
+static void omap_iommu_release_device(struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;

if (!dev->of_node || !arch_data)
return;

- iommu_device_unlink(&arch_data->iommu_dev->iommu, dev);
- iommu_group_remove_device(dev);
-
dev->archdata.iommu = NULL;
kfree(arch_data);

@@ -1763,8 +1740,8 @@ static const struct iommu_ops omap_iommu_ops = {
.map = omap_iommu_map,
.unmap = omap_iommu_unmap,
.iova_to_phys = omap_iommu_iova_to_phys,
- .add_device = omap_iommu_add_device,
- .remove_device = omap_iommu_remove_device,
+ .probe_device = omap_iommu_probe_device,
+ .release_device = omap_iommu_release_device,
.device_group = omap_iommu_device_group,
.pgsize_bitmap = OMAP_IOMMU_PGSIZES,
};
--
2.17.1